Hi,
Thank you for the link. When we visit your site we saw that captcha plugin is installed and activated, but each time we’re trying to go to https://www.informatika.edu.rs/wp-login.php, it redirects us to https://www.informatika.edu.rs/not_found. So, we have not been able to test the plugin.
Please provide an access to the https://www.informatika.edu.rs/wp-login.php or https://www.informatika.edu.rs/wp-signup.php, so we could test the plugin work.
In addition, please complete the following:
1) Try activating a standard WP theme for a while (2014, 2015) and check if the problem remains.
2) Try deactivating all of your plugins except Captcha by BesstWebSoft and also check if the problem is still present. If it is not, please activate the plugins one-by-one, meanwhile checking, after which plugin activation the problem appears again.
3) Provide your System status as well. Follow the next instruction – https://docs.google.com/document/d/1Wi2X8RdRGXk9kMszQy1xItJrpN0ncXgioH935MaBKtc/edit
4) Let us know about the results.
Sincerely,
BestWebSoft Support Team